private KeyPair rsaKeyFromBytes(byte [] keyBytes)
{
try
{
int offset = 0;
int dataLen = 0;
int version = 0;
if (keyBytes.Length != 523 && keyBytes.Length != 2339)
{
offset += 1; // skip address version
version = BitConverter.ToInt32(keyBytes, offset);
offset += 4;
}
dataLen = BitConverter.ToInt32(keyBytes, offset);
offset += 4;
Java.Math.BigInteger modulus = bigEndianToLittleEndian(keyBytes.Skip(offset).Take(dataLen).ToArray());
offset += dataLen;
dataLen = BitConverter.ToInt32(keyBytes, offset);
offset += 4;
Java.Math.BigInteger exponent = bigEndianToLittleEndian(keyBytes.Skip(offset).Take(dataLen).ToArray());
offset += dataLen;
RSAPrivateCrtKeySpec privKeySpec = null;
if (keyBytes.Length > offset)
{
dataLen = BitConverter.ToInt32(keyBytes, offset);
offset += 4;
Java.Math.BigInteger P = bigEndianToLittleEndian(keyBytes.Skip(offset).Take(dataLen).ToArray());
offset += dataLen;
dataLen = BitConverter.ToInt32(keyBytes, offset);
offset += 4;
Java.Math.BigInteger Q = bigEndianToLittleEndian(keyBytes.Skip(offset).Take(dataLen).ToArray());
offset += dataLen;
dataLen = BitConverter.ToInt32(keyBytes, offset);
offset += 4;
Java.Math.BigInteger DP = bigEndianToLittleEndian(keyBytes.Skip(offset).Take(dataLen).ToArray());
offset += dataLen;
dataLen = BitConverter.ToInt32(keyBytes, offset);
offset += 4;
Java.Math.BigInteger DQ = bigEndianToLittleEndian(keyBytes.Skip(offset).Take(dataLen).ToArray());
offset += dataLen;
dataLen = BitConverter.ToInt32(keyBytes, offset);
offset += 4;
Java.Math.BigInteger InverseQ = bigEndianToLittleEndian(keyBytes.Skip(offset).Take(dataLen).ToArray());
offset += dataLen;
dataLen = BitConverter.ToInt32(keyBytes, offset);
offset += 4;
Java.Math.BigInteger D = bigEndianToLittleEndian(keyBytes.Skip(offset).Take(dataLen).ToArray());
offset += dataLen;
privKeySpec = new RSAPrivateCrtKeySpec(modulus, exponent, D, P, Q, DP, DQ, InverseQ);
}
RSAPublicKeySpec pubKeySpec = new RSAPublicKeySpec(modulus, exponent);
KeyFactory keyFactory = KeyFactory.GetInstance("RSA");
IPublicKey pubKey = keyFactory.GeneratePublic(pubKeySpec);
IPrivateKey privKey = null;
if (privKeySpec != null)
{
privKey = keyFactory.GeneratePrivate(privKeySpec);
}
return(new KeyPair(pubKey, privKey));
}catch (Exception)
{
Logging.warn("An exception occured while trying to reconstruct PKI from bytes");
}
return(null);
}
private byte[] rsaKeyToBytes(KeyPair rsaKey, bool includePrivateParameters, bool skip_header)
{
List <byte> bytes = new List <byte>();
// TODO TODO TODO TODO TODO skip header can be later removed after the upgrade/hard fork
if (!skip_header)
{
bytes.Add((byte)1); // add version
bytes.AddRange(BitConverter.GetBytes((int)0)); // prepend pub key version
}
KeyFactory kf = KeyFactory.GetInstance("RSA");
// the ToByteArray() function returns big-endian bytes, we need little-endian
if (includePrivateParameters)
{
RSAPrivateCrtKeySpec rsaParams = (RSAPrivateCrtKeySpec)kf.GetKeySpec(rsaKey.Private, Java.Lang.Class.FromType(typeof(RSAPrivateCrtKeySpec)));
byte[] modulus = littleEndianToBigEndian(rsaParams.Modulus);
bytes.AddRange(BitConverter.GetBytes(modulus.Length));
bytes.AddRange(modulus);
byte[] publicExponent = littleEndianToBigEndian(rsaParams.PublicExponent);
bytes.AddRange(BitConverter.GetBytes(publicExponent.Length));
bytes.AddRange(publicExponent);
byte[] primeP = littleEndianToBigEndian(rsaParams.PrimeP);
bytes.AddRange(BitConverter.GetBytes(primeP.Length));
bytes.AddRange(primeP);
byte[] primeQ = littleEndianToBigEndian(rsaParams.PrimeQ);
bytes.AddRange(BitConverter.GetBytes(primeQ.Length));
bytes.AddRange(primeQ);
byte[] primeExponentP = littleEndianToBigEndian(rsaParams.PrimeExponentP);
bytes.AddRange(BitConverter.GetBytes(primeExponentP.Length));
bytes.AddRange(primeExponentP);
byte[] primeExponentQ = littleEndianToBigEndian(rsaParams.PrimeExponentQ);
bytes.AddRange(BitConverter.GetBytes(primeExponentQ.Length));
bytes.AddRange(primeExponentQ);
byte[] crtCoefficient = littleEndianToBigEndian(rsaParams.CrtCoefficient);
bytes.AddRange(BitConverter.GetBytes(crtCoefficient.Length));
bytes.AddRange(crtCoefficient);
byte[] privateExponent = littleEndianToBigEndian(rsaParams.PrivateExponent);
bytes.AddRange(BitConverter.GetBytes(privateExponent.Length));
bytes.AddRange(privateExponent);
}
else
{
RSAPublicKeySpec rsaPubParams = (RSAPublicKeySpec)kf.GetKeySpec(rsaKey.Public, Java.Lang.Class.FromType(typeof(RSAPublicKeySpec)));
byte[] modulus = littleEndianToBigEndian(rsaPubParams.Modulus);
bytes.AddRange(BitConverter.GetBytes(modulus.Length));
bytes.AddRange(modulus);
byte[] publicExponent = littleEndianToBigEndian(rsaPubParams.PublicExponent);
bytes.AddRange(BitConverter.GetBytes(publicExponent.Length));
bytes.AddRange(publicExponent);
}
return(bytes.ToArray());
}
public override void ImportParameters(RSAParameters parameters)
{
try
{
//Console.WriteLine("enter ImportParameters " + new { parameters.Exponent, parameters.Modulus, parameters.D });
// http://developer.android.com/reference/java/security/KeyFactory.html
// X:\jsc.svn\core\ScriptCoreLibJava\java\security\interfaces\RSAPublicKey.cs
// https://gist.github.com/manzke/1068441
// http://stackoverflow.com/questions/11410770/java-load-rsa-public-key-from-file
// https://sites.google.com/a/jsc-solutions.net/backlog/knowledge-base/2014/201408/20140829
// https://sites.google.com/a/jsc-solutions.net/backlog/knowledge-base/2015/201503/20150323
// X:\jsc.svn\examples\javascript\Test\TestWebCryptoKeyExport\TestWebCryptoKeyExport\ApplicationWebService.cs
// tested by ?
var xKeyFactory = KeyFactory.getInstance("RSA");
var rsaModulusBytes = parameters.Modulus;
#region firstByte Modulus
var firstByte = rsaModulusBytes[0];
if (firstByte != 0)
{
// http://stackoverflow.com/questions/3970684/rsa-encryption-in-net-decryption-in-java-java-throws-modulus-not-positive
// jvm likes a leading 0 ?
rsaModulusBytes = new byte[parameters.Modulus.Length + 1];
Array.Copy(
parameters.Modulus,
0,
rsaModulusBytes,
1,
parameters.Modulus.Length
);
}
#endregion
// https://msdn.microsoft.com/en-us/library/system.security.cryptography.rsaparameters(v=vs.110).aspx
//Console.WriteLine("RSACryptoServiceProvider.ImportParameters " + new
//{
// rsaModulusBytes = rsaModulusBytes.Length,
// rsaModulusBytes0 = rsaModulusBytes[0],
// rsaModulusBytes1 = rsaModulusBytes[1],
//});
// https://docs.oracle.com/javase/7/docs/api/java/security/spec/RSAPrivateKeySpec.html
// http://www.herongyang.com/Cryptography/RSA-BigInteger-Convert-Byte-Sequences-to-Positive-Integers.html
// https://docs.oracle.com/javase/7/docs/api/java/math/BigInteger.html#BigInteger(int,%20byte[])
Func <byte[], BigInteger> f = bytes => new BigInteger(1, (sbyte[])(object)bytes);
var modulus = f(rsaModulusBytes);
// http://www.jensign.com/JavaScience/dotnet/RSAdotnet4/
// in J#, the java.math.BigInteger constructor expects byte[] data to be in BIG-endian order, consistent with Java api usage
// Z:\jsc.svn\examples\javascript\crypto\WebServiceAuthorityExperiment\WebServiceAuthorityExperiment\ApplicationWebService.cs
// https://community.oracle.com/thread/1531315?start=0&tstart=0
var xRSAPrivateKeySpec = new RSAPrivateCrtKeySpec(
modulus: modulus,
publicExponent: f(parameters.Exponent),
privateExponent: f(parameters.D),
primeP: f(parameters.P), // prime1
primeQ: f(parameters.Q), // prime2
primeExponentP: f(parameters.DP), // exponent1
primeExponentQ: f(parameters.DQ), // exponent2
crtCoefficient: f(parameters.InverseQ) // coefficient
);
var xRSAPublicKeySpec = new RSAPublicKeySpec(
modulus: f(rsaModulusBytes),
publicExponent: f(parameters.Exponent)
);
this.InternalRSAPrivateKey = (RSAPrivateCrtKey)xKeyFactory.generatePrivate(xRSAPrivateKeySpec);
this.InternalRSAPublicKey = (RSAPublicKey)xKeyFactory.generatePublic(xRSAPublicKeySpec);
this.InternalParameters = parameters;
//Console.WriteLine("ImportParameters " + new { this.KeySize });
}
catch
{
throw;
}
}
